6.23 ATANH — Hyperbolic arctangent function

Description:

ATANH(X) computes the hyperbolic arctangent of X (inverse of TANH(X)).

Standard:

GNU extension

Class:

Elemental function

Syntax:

RESULT = ATANH(X)

Arguments:

X	The type shall be REAL(*) with a magnitude that is less than or equal to one.

Return value:

The return value is of type REAL(*) and it lies in the range -\infty \leq \atanh(x) \leq \infty.

Example:

          PROGRAM test_atanh
            REAL, DIMENSION(3) :: x = (/ -1.0, 0.0, 1.0 /)
            WRITE (*,*) ATANH(x)
          END PROGRAM
     

Specific names:

Name	Argument	Return type	Standard
DATANH(X)	REAL(8) X	REAL(8)	GNU extension

See also:

Inverse function: TANH